66131385 has 8 divisors (see below), whose sum is σ = 105810240. Its totient is φ = 35270064.

The previous prime is 66131369. The next prime is 66131393. The reversal of 66131385 is 58313166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66131385 - 2⁴ = 66131369 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2204365 + ... + 2204394.

It is an arithmetic number, because the mean of its divisors is an integer number (13226280).

Almost surely, 2^66131385 is an apocalyptic number.

It is an amenable number.

66131385 is a deficient number, since it is larger than the sum of its proper divisors (39678855).

66131385 is a wasteful number, since it uses less digits than its factorization.

66131385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4408767.

The product of its digits is 12960, while the sum is 33.

The square root of 66131385 is about 8132.1205721509. The cubic root of 66131385 is about 404.3919850856.

The spelling of 66131385 in words is "sixty-six million, one hundred thirty-one thousand, three hundred eighty-five".